A friend of mine is in another faction to build a station for me, but says he doesn't have the right priviliges to do so. What does he need to have minimally?

He has currently:
been assigned to both ships where the rms are stored in
the rms are owned by the faction he's in
he is assigned to the builders, in the entrance of a ship where he is too
some builders are assigned to his faction
he is in space, controlled by his faction
he has the 'build space stations' privilige